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Finding the Third Proportional to 665 and 857.50

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Solution

The third proportional to 665 and 857.50 is: 1,105.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    665 : 857.50 = 857.50 : x
  2. Step 2: Convert to fraction form
    665/857.50 = 857.50/x
  3. Step 3: Cross multiply
    665x = 857.50 × 857.50
  4. Step 4: Simplify right side
    665x = 735,306.25
  5. Step 5: Solve for x
    x = 735,306.25/665
  6. Step 6: Final answer
    x = 1,105.72

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Why These Related Problems?

These problems maintain the same ratio (1.29) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.